Dynamo-electric machine



(No Model.) 2 Sheets-Sheet 1.

W. SAWYBR. Dynamo Electric Machine.

No. 235,385. Patented Dec. 14,1880.

(No Model.) 7 2Sheets-Sheet 2. W. SAWYER. Dynamo Electric Machine.

No. 235,385. Patented Dec. 14,1880.

J1 M t Z FIG. 4.

N-PETERs, FHOTO LITHOGRAPHER, WASHINGTON, o c.

Nrrnn STATES PATENT Grates.

WVILLIAM SAWYER, OF NEW YORK, N. Y., ASSIGNOR TO EASTERN ELECTRIC MANUFACTURING COMPANY, OF MIDDLETOWN, CONNECTICUT.

DYNAMO-ELECTRlC MACHlNE.

SPECIFICATION forming part of Letters Patent No. 235,385, dated December 14, 1880.

Application filed August 19, 1880.

To all whom it may concern:

Be it known that I,W1LLIAM SAWYER, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Dynamo Electric Machines; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification. 1 My invention relates to dynamo-electric machines; and it consists, primarily, in means for cooling those parts of the machine which are liable to become heated, and thereby increase the resistance and burn the insulated covering of the wires; secondly, it consists in a hollow armature-shaft provided at one end with an auxiliary ingress-pipe, and at the other with a similar exit-pipe, for conveying the water through the shaft to a series of cooling-tubes :5 or perforations in the armature; thirdly, it

consists in perforated metallic caps, screwthreaded, and secured to the armature by a shoulder in said armature, so that the caps will come flush with the sides and form end extensions of the armature.

The device as an entirety is an improvement on the dynamo-electric machine granted to me in Letters Patent No. 227 ,845 of May 18,1880.

The details of construction and method of operation of the machine will be more fully set forth in the specification, and pointed out in the accompanying drawings, in which- Figure l is a perspective view of the machine. Fig. 2 is a longitudinal section through the armature, showing the hollowed shaft, auxiliary pipes, and screw-threaded caps. Fig. 3 is a cross-section through the armature, showing the series of perforations or cooling-tubes. Fig. 4 is a section through the supporting-aim and shaft-bearin g. Fig. 5 is a perspective view, partly in section, of the machine, showing the auxiliary pipes.

It is not deemed necessary for the purposes here required to describe particularly the method of electrically connecting up the ma- (No model.)

chine, as the parti are applicable to a cular improvements shown ny machine of this nature.

In order to make where the caps L a and screw the caps armature. caps and armature a smooth and perfect joint re secured to the armature,

I cut a shoulder Z in the armature as shown directly on the ends of the The screw-threaded parts of the are painted or coated with red lead or any suitable cement, so as to make a water-tightjoint and prevent leakage to the sides of the armature.

By means of the pipes H, I am enabled to convey the water directly through the ends of the shaft instead of bringing it through the top of the bearings, as in my former patent, and in consequence am also enabled to dispense with the several screwcaps around the shaft in order to make the joints water-tight.

The pipes fit snugly within the hollowed ends of the shaft, and yet sufiicient space is left to allow the shaft to turn freely without appreciable friction on that the movement the sides of the pipes, so of the sh aft is not retarded.

The pipes may be coated within by any suitable material to prevent rusting, and the interior of the caps l may be coated in the same way. Preferably through the pipes and caps, and after they I prefer to pour coaLtar have been emptied to bake the residue.

lVhere the shaft passes through the box It I provide an intermediate brass bushing, S, and it will be evident from the above that this construction dispenses with the perforated bearings, as shown in my former patent, and greatly simplifies and cheapens the machine.

The standards E are made of a single piece of cast-iron, having the shaft-bearings K cast with them. The lower ends of the standards have extensions a, that come flush with the ends of the lower 0 and are secured d by bolts to.

r back plate of the magnet, irectly to said lower plate The vertical limbs and base plate of the magnet are cast in one piece. This form of construction is not only economical, but avoids the necessity of joining the limbs and baseplate by bolts, &c., which are liable to become loosened by the constant jar of the limbs and base-plate and eventually cause them to spread.

The lower plate has cast with it on each side two or more lugs, a, by means of which the machine can be properly secured to the floor or platform.

Pole-plates O are supported on shoulders let into the magnet-limbs, and are bolted to the sides or vertical limbs of the magnet by bolts A dust-cap, J, extends across the top of the rotating armature. The armature-shaft is rotated by a band, I, and pulley G, or in any convenient mechanical way.

The water brought into the shaft and carried through the series of tubes or perforations in the armature tends to cool the armature and adjacent parts.

In connection with this form of armature and method of introducing Water, I may use the heat-conducting pieces described in my former patent.

Having thus described my invention, what I claim is 1. In a dynamo-electric machine, a perforated armature provided with a water-tight cap at each end, screwed into a shoulder at the ends of said armature, substantially as described.

2. In a dynamo-electric machine, the combi- 3 5 nation of a perforated armature for the passage of a stream of water with an armature shaft hollowed at its ends and having an ingress water-pipe, whereby the water is introduced into the shaft and armature directly 40 WM. SAWYER. Witnesses:

LEONARD SAWYER, G. G. THATOHER, JOHN F. TAPSCOTT. 

